Question

Which of the following Pteridophytes belong to class Pteropsida
A. Equisetum and Psilotum
B. Lycopodium and Adiantum
C. Selaginella and Pteris
D. Pteris and Adiantum
E. Dryopteris and Psilotum

Answer 1

Hint: A vascular plant (including xylem and phloem) that disperses spores is a pteridophyte. However, no flowers or seeds are produced by Pteridophytes. They are often referred to as 'Cryptogams', suggesting that their means of reproduction are hidden away.

Complete answer: The Pteropsida class is characterized by the presence, dissected leaves, and sporangia that are formed on the leaves of pteridophytic plants. There are three groups of Pteropsida-
1. Filicineae
2. Gymnospermae
3. Angiospermae.
Pteridophytes are divided into four classes: Psilopsida, Sphenopsida, Lycopsida, and Pteropsida.
Now let us look at all the options to get the correct answer,
-Equisetum and Psilotum- Equisetum is a member of a class called Sphenopsida, whereas Psilotum is a tracheophyte belonging to class Polypodiopsida.
-Lycopodium and Adiantum- Lycopodium is a member of a genus called Lycopsida and Adiantum is a member of a class called Pteropsida.
-Selaginella and Pteris- Selaginella is from a genus called Lycopsida and Pteris belongs to the Pteropsida class.
-Pteris and Adiantum- Pteris belongs to the Pteropsida class and Adiantum is a member of a class called Pteropsida.
-Dryopteris and Psilotum- Dryopteris belongs to the Pteropsida class and Psilotum is a tracheophyte belonging to class Polypodiopsida.
 Hence, the correct option is D- Pteris, and Adiantum

Note: The function of pteridophytes or their importance is as follows:
1. In Pteridophytes, the dominant stage in their life cycle is the gametophytic body.
2. In cool and shady areas, they are mainly found.
3. These plants are very useful and also serve as soil binders for medicinal purposes.